I don’t know what to do

Ever since yr 3 I’ve been bullied and now I’m in yr 6 it’s even worse. This group of girls and some boys r fat shaming me and two boys r calling me names. I’ve started cutting and I’ve tried to get help from friends but it isn’t working. Every night I’d write something down in my journal cause it was one of the tips given to not wanna commit suicide. But it hasn’t really worked and I’m crying myself to sleep and still cutting myself. Ive only just turned 12 like 2 weeks ago.